18223693 has 4 divisors (see below), whose sum is σ = 18288828. Its totient is φ = 18158560.

The previous prime is 18223663. The next prime is 18223703. The reversal of 18223693 is 39632281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13264164 + 4959529 = 3642^2 + 2227^2 .

It is a cyclic number.

It is not a de Polignac number, because 18223693 - 2⁹ = 18223181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32146 + ... + 32707.

It is an arithmetic number, because the mean of its divisors is an integer number (4572207).

Almost surely, 2^18223693 is an apocalyptic number.

It is an amenable number.

18223693 is a deficient number, since it is larger than the sum of its proper divisors (65135).

18223693 is an equidigital number, since it uses as much as digits as its factorization.

18223693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65134.

The product of its digits is 15552, while the sum is 34.

The square root of 18223693 is about 4268.9217608197. The cubic root of 18223693 is about 263.1553054391.

It can be divided in two parts, 182236 and 93, that added together give a square (182329 = 427²).

The spelling of 18223693 in words is "eighteen million, two hundred twenty-three thousand, six hundred ninety-three".